标准光？
QSFP28光？椴馐园
Description
测试板特点
● 专业仿真团队设计 ，信号质量优异
● 支持 QSFP28 和 QSFP+光？榈牟馐
● 支持 4V 或 3.3V 供电
● USB 接口直接会见？
● 可使用电源适配器直接供电
● 支持板上电流检测
接口说明
◆ QSFP28 接口（J1）
J1 为 QSFP28 光？榈谋曜冀涌,测试时将光？榻尤敫媒涌。
◆ 电源接口（J3、J6）
J3电源接口
J3 电源接口有两个管脚,管脚界说如下:
J6 电源接口可利便电源适配器供电,讨论支持 5.5*2.5mm 和 5.5*2.1mm。
◆ USB 接口（J4）
测试板的 USB 接口接纳 USB 类型 B 插座 ，毗连性更为可靠。
USB类型B插座
◆ 控制接口（J8、J9、J005、J006）
输入电源选择接口
J8、J9 用于选择供电电压 ，当用 3.3V 供电时 ，将 J8、J9 的跳线帽都接到丝印为“3.3V”一侧；当用 4V 供电时 ，将 J8、J9 的跳线帽都接到“4V”一侧 ，其管脚界说如下：
◆ I2C 接口（J5）
I2C接口
当不希望通道 USB 接口会见？槭 ，可直接通过 J5 会见？。注重 ，此时需要断开 USB 毗连。J006 的管 脚界说如下：
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